摘要
采用了有限元数值模拟的方法,探讨了有覆盖层方形凹陷地形,在SV波的作用下地面运动的特征,结果表明:(1)覆盖层的存在对地表位移的幅值具有较明显的增大效应,即使在覆盖层很薄的情况下(覆盖层为模型高度的1/20)。(2)入射角分别为0°(垂直)、10°、20°、30°时,由于凹陷的存在对入射波有屏蔽作用,波垂直入射与斜入射相比有明显的不同,尤其是对凹陷左侧地面的位移影响更加突出。(3)随着入射角θ的增大,在x方向上,覆盖层对凹陷底部地面的地震动增大效应在减弱,在凹陷左右两侧顶角附近增大效应有小幅增大;在y方向上,覆盖层对凹陷底部地面的地震动增大效应有小幅增强,而对左右两侧顶角附近地面的地震动增大效应却是逐渐减小的。
In this paper, the finite element numerical simulation method is used to explore the ground motion characteristics of the canyon square covering layer under the action of SV wave, the results show that（1）the presence of the coating layer had great greater synergy on the surface displacement amplitude, even in the case of very thin cover layer（such as the paper cover layer is 1/20 the height of the model）;（2）when the angles of incidence are 0°（vertical）, 10°, 20°, 30°, the shielding effect will be produced on the angles because of the existence of the canyon, and when compared to the wave normal incidence, the oblique incidence is significantly different, especially the displacement on the left side of the canyon surface becomes more prominent;（3）with the increase of the incident angle θ in the x direction, the cover layer on the bottom surface of the canyon increased,the seismic effect in weakening in the vicinity of the left and right sides of the canyon apex synergy slightly increased; in y direction, the cover layer on the bottom surface of the canyon earthquake increased slightly, the enhanced effect around the main part of the increase was concentrated in the vicinity of the canyon in the left and right top corner.
出处
《苏州科技学院学报（工程技术版）》
CAS
2016年第2期33-37,共5页
Journal of Suzhou University of Science and Technology （Engineering and Technology）
基金
国家自然科学基金项目(51278323)
关键词
凹陷地形
SV波斜入射
地面运动
放大系数
canyon topography
inclined SV wave
ground motion
amplification factor
